The invention provides a cigarette filter (1) the biodegradation of the material (3) which is assisted by the incorporation of swellable means in the filter so that upon exposure to moisture the volume of the filter is increased, preferably to the extent of breaking open a filter wrap (2) which enclosed it.
申请公布号
WO9416581(A1)
申请公布日期
1994.08.04
申请号
WO1994GB00086
申请日期
1994.01.17
申请人
ROTHMANS INTERNATIONAL SERVICES LIMITED;SINCLAIR, NEIL, MURRAY;DART, ROBERT, KINSEY